I don't think it's entirely the autism speaking, a lot of people put an incredible amount of stock in, essentially, blood and soil ideology, especially the blood. It's something I noticed in highschool, that people will treat their family's, and especially their parent's, achievements as their own - taking pride in them and ascribing themselves those same abilities. That then extends to treating their family's shame as their own personal shames, so like this, they try to hide or excuse it - "I'm not a nazi, so my grandfather couldn't have been".
I think autism made it more obvious for me, but plenty of neurotypicals aren't like that, whether they notice others are or not.
Of course, totally not antisemitic for you to call for a second holocaust against Jews if they're also committing their own holocaust. As we all know, we just need one more genocide and everything will be finally sorted out.
I'm not a zionist, I can just see where the line between antizionism and antisemitism is. You know full well that it evokes the holocaust, you're not even trying to hide it, so you know full well that it crosses the line into antisemitism.